Mixing efficiency and energy consumption for five generic microchannel designs

Mixing is an essential part of chemical processes. In the present work, homogeneous mixing at relatively high throughput for a single microchannel (of 1-18 mL/min) was investigated in microchannels with different dimensions, cross sections and mixing elements (with and without structured internal surface). A method based on the Villermaux-Dushman reaction was employed and the intensity of segregation was determined. Further, simulations were carried out to investigate the mixing time and the effectiveness of different microchannels. The data obtained for mixing time was correlated in terms of specific power dissipation which can be used for a priori predictions of mixing in microchannels. The results show that a microchannel with structured internal surface shows better performance in terms of mixing efficiency which has to be paid by high energy consumption. (C) 2010 Elsevier B.V. All rights reserved.

[1]  Dusan Boskovic,et al.  Novel multifunctional microreaction unit for chemical engineering , 2004 .

[2]  J. Villermaux,et al.  Characterisation of micromixing efficiency by the iodide–iodate reaction system. Part II: kinetic study , 2000 .

[3]  Holger Löwe,et al.  Selectivity Gains and Energy Savings for the Industrial Phenyl Boronic Acid Process Using Micromixer/Tubular Reactors , 2004 .

[4]  T. Maeder,et al.  A microreactor-based system for the study of fast exothermic reactions in liquid phase: characterization of the system , 2004 .

[5]  A. Wilhelm,et al.  Effects of ultrasound on micromixing in flow cell , 2000 .

[6]  Volker Hessel,et al.  Micro process engineering : a comprehensive handbook , 2009 .

[7]  L. Falk,et al.  Characterization of Mixing and Segregation in Homogeneous Flow Systems , 2013 .

[8]  John R. Bourne,et al.  Mixing and fast chemical reactionITest reactions to determine segregation , 1981 .

[9]  L. Falk,et al.  Characterisation of micromixing efficiency by the iodide–iodate reaction system. Part I: experimental procedure , 2000 .

[10]  J. R. Bourne,et al.  Comparison of the engulfment and the interaction-by-exchange-with-the-mean micromixing models , 1990 .

[11]  Jerzy Bałdyga,et al.  Simplification of Micromixing Calculations. I. Derivation and Application of New Model , 1989 .

[12]  V. Hessel,et al.  Comprar Micro Process Engineering : A Comprehensive Handbook | Volker Hessel | 9783527315505 | Wiley , 2009 .

[13]  Slobodan Panić,et al.  Experimental approaches to a better understanding of mixing performance of microfluidic devices , 2004 .

[14]  V. Hessel,et al.  Determination of the segregation index to sense the mixing quality of pilot- and production-scale microstructured mixers , 2007 .

[15]  N. Nguyen,et al.  Passive and Active Micromixers , 2013 .

[16]  V Hessel,et al.  An optimised split-and-recombine micro-mixer with uniform chaotic mixing. , 2004, Lab on a chip.

[17]  P. Woias,et al.  Convective mixing and chemical reactions in microchannels with high flow rates , 2006 .

[18]  Hideharu Nagasawa,et al.  Design of a New Micromixer for Instant Mixing Based on the Collision of Micro Segments , 2005 .

[19]  Laurent Falk,et al.  Performance comparison of micromixers , 2010 .

[20]  Yuanqing Zhao,et al.  A membrane reactor intensifying micromixing : Effects of parameters on segregation index , 2006 .

[21]  Lei Shao,et al.  Investigation of Micromixing Efficiency in a Novel High-Throughput Microporous Tube-in-Tube Microchannel Reactor , 2009 .

[22]  Laurent Falk,et al.  A new parallel competing reaction system for assessing micromixing efficiency—Determination of micromixing time by a simple mixing model , 1996 .

[23]  Duu-Jong Lee,et al.  Micromixing efficiency in static mixer , 2001 .